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//===----------------------------------------------------------------------===//
//
// This source file is part of the SwiftCertificates open source project
//
// Copyright (c) 2022 Apple Inc. and the SwiftCertificates project authors
// Licensed under Apache License v2.0
//
// See LICENSE.txt for license information
// See CONTRIBUTORS.txt for the list of SwiftCertificates project authors
//
// SPDX-License-Identifier: Apache-2.0
//
//===----------------------------------------------------------------------===//
/// Provides a result-builder style DSL for constructing ``Certificate/Extensions-swift.struct`` values.
///
/// This DSL allows us to construct extensions straightforwardly, using their high-level representation instead of
/// the erased representation provided by ``Certificate/Extension``. For example, a simple set of
/// extensions can be produced like this:
///
/// ```swift
/// let extensions = Certificate.Extensions {
/// Critical(
/// KeyUsage(digitalSignature: true, keyCertSign: true, cRLSign: true)
/// )
///
/// ExtendedKeyUsage([.serverAuth, .clientAuth])
///
/// Critical(
/// BasicConstraints.isCertificateAuthority(maxPathLength: 0)
/// )
///
/// AuthorityInformationAccess([.init(method: .ocspServer, location: .uniformResourceIdentifier("http://ocsp.digicert.com"))])
/// }
/// ```
///
/// Users can extend this syntax for their own extensions by conforming their semantic type to ``CertificateExtensionConvertible``.
/// This is the only requirement for adding new extensions to this builder syntax.
///
/// Users are also able to mark specific extensions as critical by using the ``Critical`` helper type.
@resultBuilder
public struct ExtensionsBuilder {
@inlinable
public static func buildExpression<Extension: CertificateExtensionConvertible>(
_ expression: Extension
) -> Result<Certificate.Extensions, any Error> {
Result {
try Certificate.Extensions([expression.makeCertificateExtension()])
}
}
@inlinable
public static func buildExpression(
_ expression: Certificate.Extensions
) -> Result<Certificate.Extensions, any Error> {
.success(expression)
}
@inlinable
public static func buildExpression() -> Result<Certificate.Extensions, any Error> {
.success(Certificate.Extensions())
}
@inlinable
public static func buildBlock() -> Result<Certificate.Extensions, any Error> {
.success(Certificate.Extensions())
}
@inlinable
public static func buildBlock(
_ components: Result<Certificate.Extensions, any Error>...
) -> Result<Certificate.Extensions, any Error> {
Result {
try Certificate.Extensions(try components.lazy.flatMap { try $0.get() })
}
}
@inlinable
public static func buildOptional(
_ component: Result<Certificate.Extensions, any Error>?
) -> Result<Certificate.Extensions, any Error> {
component ?? .success(Certificate.Extensions())
}
@inlinable
public static func buildEither(
first component: Result<Certificate.Extensions, any Error>
) -> Result<Certificate.Extensions, any Error> {
component
}
@inlinable
public static func buildEither(
second component: Result<Certificate.Extensions, any Error>
) -> Result<Certificate.Extensions, any Error> {
component
}
@inlinable
public static func buildArray(
_ components: [Result<Certificate.Extensions, any Error>]
) -> Result<Certificate.Extensions, any Error> {
Result {
try Certificate.Extensions(try components.lazy.flatMap { try $0.get() })
}
}
@inlinable
public static func buildLimitedAvailability(
_ component: Result<Certificate.Extensions, any Error>
) -> Result<Certificate.Extensions, any Error> {
component
}
}
/// Conforming types are capable of being erased into ``Certificate/Extension`` values.
///
/// Note that for most extension types, the returned ``Certificate/Extension`` should have its
/// ``Certificate/Extension/critical`` value set to `false`. This allows the ``Critical`` helper
/// type to fulfill its function as expected.
public protocol CertificateExtensionConvertible {
/// Convert the value into a ``Certificate/Extension``.
func makeCertificateExtension() throws -> Certificate.Extension
}
/// Marks a given ``CertificateExtensionConvertible`` value as critical.
///
/// This type is used only within the ``ExtensionsBuilder`` DSL to mark extensions as critical.
@frozen
public struct Critical<BaseExtension: CertificateExtensionConvertible>: CertificateExtensionConvertible {
/// The ``CertificateExtensionConvertible`` backing this value.
public var base: BaseExtension
/// Wrap a ``CertificateExtensionConvertible`` value and mark it critical.
@inlinable
public init(_ base: BaseExtension) {
self.base = base
}
@inlinable
public func makeCertificateExtension() throws -> Certificate.Extension {
var ext = try self.base.makeCertificateExtension()
ext.critical = true
return ext
}
}
|
